Don't know if it's cheaper or not, but those interested in Armageddon …Don't know if it's cheaper or not, but those interested in Armageddon might be better served with the fanatical bundle:https://www.fanatical.com/en/bundle/warhammer-40000-armageddon-bundle

Exactly, with GOG youre getting a game your grandchildrens will be able to play, whereas on Steam you getting a game you can only play until Steam winds their servers up or changes their business model.